The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Pilot-Aided Iterative Frequency Offset Estimation for Digital Video Broadcasting Systems

디지털 비디오 방송 시스템에서의 파일럿을 이용한 반복적 주파수 옵셋 추정방법

  • 이경택 (전자부품연구원 DxB.통신융합연구센터, 연세대학교 대학원 전기공학과) ;
  • 서종수 (연세대학교 전기전자공학과)
  • Published : 2007.05.31
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Abstract

The main disadvantage of orthogonal frequency division multiplexing (OFDM) systems is its sensitivity to carrier frequency offset and timing offset. This paper proposes a simple way of improving the performance of the integer frequency offset (IFO) estimator in OFDM-based digital video broadcasting (DVB) system. By modifying the conventional maximum likelihood (ML) estimator to have multi-stage estimation strategy, IFO estimator is derived. Simulations indicate that the proposed IFO estimator works robustly with reduced computational burden when compared to ML estimator.

OFDM(orthogonal frequency division multiplexing) 시스템은 시간 동기 및 주파수 옵셋 추정 오차에 따라 시스템 성능이 좌우된다. 본 논문에서는, OFDM을 기반으로 한 디지털 비디오 방송(digital video broadcasting) 시스템을 위한 향상된 정수배 주파수 옵셋 추정 방법을 제안한다. 제안된 정수배 주파수 옵셋 추정기는 기존의 ML 추정기에 다단계 추정 방법을 적용하여 개선한 방법이다. 실험 결과를 통해, 제안된 주파수 옵셋 추정 방법이 기존의 ML 추정기에 비해 적은 연산량으로 향상된 주파수 옵셋 추정 성능을 가진다.

Keywords

References

  1. J. A. C. Bingham, 'Multicarrier modulation for data transmission: An idea whose time has come,' IEEE commun. Mag., vol.28, pp.5-14, May 1990 https://doi.org/10.1109/35.54342
  2. W. Y. Zou and Y. Wu, 'COFDM: An overview,' IEEE Trans. Broadcasting, vol.41, pp.1-8, March 1995 https://doi.org/10.1109/11.372015
  3. R. van Nee, G. Awater, M. Morikura, H. Takanashi, M. Webster, and K. W. Halford, 'New high-rate wireless LAN standards,' IEEE Commun. Mag., vol.37, no.12, pp.82-88, Dec. 1999
  4. A. Doufexi, S. Armour, M. Butler, A. Nix, D. Bull, J. McGeehan, and P. Karlsson, 'A comparison of the HIPERLAN/2 and IEEE 802.11a wireless LAN standards,' IEEE Commun. Mag., vol.40, no.5, pp.172-180, May 2002 https://doi.org/10.1109/35.1000232
  5. ETSI ETS 300 401, 'Radio broadcasting systems: digital audio broadcasting (DAB) to mobile, portable and fixed receivers,' ETSI, Tech. Rep., Feb. 1995
  6. ETSI ETS 300 744, 'Digital video broadcasting (DVB): frame structure, channel coding and modulation for digital terrestrial television (DVB-T),' ETSI, Tech. Rep., March 1997
  7. M. Speth, F. Classen, and H. Meyr, 'Frame synchronization of OFDM systems in frequency selective fading channels,' in Proc. of VTC'97, pp.1807-1811, May 1997
  8. T. Pollet, 'The BER performance of OFDM systems using nonsynchromized sampling,' in Proc. of GLOBCOM'94, pp.253-257, 1994
  9. P. H. Moose, 'A technique for orthogonal frequency division multiplexing frequency offset correcting,' IEEE Trans .Commun., vol.42, pp. 2908-2914, October 1994 https://doi.org/10.1109/26.328961
  10. J.-J. van de Beek, M. Sandell, and P. O. Borjesson, 'ML estimation of time and frequency offset in OFDM systems,' IEEE Trans. Signal Processing, vol.45, pp.1800-1805, July 1997 https://doi.org/10.1109/78.599949
  11. C. Yan, S. Li, Y. Tang X. Luo, and J. Fang, 'A novel frequency offset estimation method for OFDM systems with large estimation range,' IEEE Trans. Broadcasting, vol.52, pp.58-61, March 2006 https://doi.org/10.1109/TBC.2005.856725
  12. Z. Zhang, K. Long, M. Zhao, and Y. Liu, 'Joint frame synchronization and frequency offset estimation in OFDM systems,' IEEE Trans. Broadcasting, vol.51, pp.389-394, September 2005 https://doi.org/10.1109/TBC.2005.851702
  13. B. Ai, Z. Yang, C. Y. Pan, J. H. Ge, Y. Wang, and Z. Lu, 'On the synchronization techniques for wireless OFDM systems,' IEEE Trans. Broadcasting, vol.52, pp.236-244, June 2006 https://doi.org/10.1109/TBC.2006.872990
  14. T. M. Schmidl and D.C. Cox, Robust frequency and timing synchronization for OFDM,' IEEE Trans. Commun., vol.45, pp.1613-1621, December 1997 https://doi.org/10.1109/26.650240
  15. M. Morelli, A. N. D'Andrea, and U. Mengali, 'Frequency ambiguity resolution in OFDM systems,' IEEE Commun. Lett., vol.4, pp.134-136, April 2000 https://doi.org/10.1109/4234.841321
  16. Y. Zhang, J. Cosmas, M. Bard, Y.-H. Song, 'Diversity gain for DVB-H by using transmitter/receiver cyclic delay diversity,' IEEE Trans. Broadcasting, vol.52, no.4, pp.464-474, December 2006 https://doi.org/10.1109/TBC.2006.884738